%% 
%%  A DANTE-Edition example
%% 
%%  Example 16-04-27 on page 252.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}

\usepackage{pstricks,pst-node}

\begin{document}
\begin{pspicture}(0.5,0)(4,3)  \large
  \psset{nodesep=3pt,linearc=0.3,boxsize=2mm}
  \rput(3,3){\rnode{A}{1}}
  \rput(1,1){\rnode{B}{2}}
  \ncarcbox[arcangle=60]{A}{B}
  \ncarcbox[arcangle=-60,linecolor=lightgray]{A}{B}
  \ncarcbox[arcangle=-60,linecolor=blue]{B}{A}
\end{pspicture}
\end{document}